A UPF of 50+ indicates that this fabric was tested and will block up to 98% of the Sun’s UVA & UVB rays.
For More Details Visit: https://www.sunnsand.net/upf-protection/
This is actually the 2nd time I’ve purchased this same hat. Love the color, love that it rolls up, love that I can wear it even when my big curly hair is up. I get compliments on it all the time!